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linux-next/drivers/mfd/sta2x11-mfd.c
Mark Brown 0848c94fb4 mfd: core: Push irqdomain mapping out into devices 
Currently the MFD core supports remapping MFD cell interrupts using an
irqdomain but only if the MFD is being instantiated using device tree
and only if the device tree bindings use the pattern of registering IPs
in the device tree with compatible properties.  This will be actively
harmful for drivers which support non-DT platforms and use this pattern
for their DT bindings as it will mean that the core will silently change
remapping behaviour and it is also limiting for drivers which don't do
DT with this particular pattern.  There is also a potential fragility if
there are interrupts not associated with MFD cells and all the cells are
omitted from the device tree for some reason.

Instead change the code to take an IRQ domain as an optional argument,
allowing drivers to take the decision about the parent domain for their
interrupts.  The one current user of this feature is ab8500-core, it has
the domain lookup pushed out into the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-15 23:22:04 +02:00

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/*
* Copyright (c) 2009-2011 Wind River Systems, Inc.
* Copyright (c) 2011 ST Microelectronics (Alessandro Rubini)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/sta2x11-mfd.h>
#include <asm/sta2x11.h>
/* This describes STA2X11 MFD chip for us, we may have several */
struct sta2x11_mfd {
struct sta2x11_instance *instance;
spinlock_t lock;
struct list_head list;
void __iomem *sctl_regs;
void __iomem *apbreg_regs;
};
static LIST_HEAD(sta2x11_mfd_list);
/* Three functions to act on the list */
static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev)
{
struct sta2x11_instance *instance;
struct sta2x11_mfd *mfd;
if (!pdev && !list_empty(&sta2x11_mfd_list)) {
pr_warning("%s: Unspecified device, "
"using first instance\n", __func__);
return list_entry(sta2x11_mfd_list.next,
struct sta2x11_mfd, list);
}
instance = sta2x11_get_instance(pdev);
if (!instance)
return NULL;
list_for_each_entry(mfd, &sta2x11_mfd_list, list) {
if (mfd->instance == instance)
return mfd;
}
return NULL;
}
static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags)
{
struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
struct sta2x11_instance *instance;
if (mfd)
return -EBUSY;
instance = sta2x11_get_instance(pdev);
if (!instance)
return -EINVAL;
mfd = kzalloc(sizeof(*mfd), flags);
if (!mfd)
return -ENOMEM;
INIT_LIST_HEAD(&mfd->list);
spin_lock_init(&mfd->lock);
mfd->instance = instance;
list_add(&mfd->list, &sta2x11_mfd_list);
return 0;
}
static int __devexit mfd_remove(struct pci_dev *pdev)
{
struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
if (!mfd)
return -ENODEV;
list_del(&mfd->list);
kfree(mfd);
return 0;
}
/* These two functions are exported and are not expected to fail */
u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
{
struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
u32 r;
unsigned long flags;
if (!mfd) {
dev_warn(&pdev->dev, ": can't access sctl regs\n");
return 0;
}
if (!mfd->sctl_regs) {
dev_warn(&pdev->dev, ": system ctl not initialized\n");
return 0;
}
spin_lock_irqsave(&mfd->lock, flags);
r = readl(mfd->sctl_regs + reg);
r &= ~mask;
r |= val;
if (mask)
writel(r, mfd->sctl_regs + reg);
spin_unlock_irqrestore(&mfd->lock, flags);
return r;
}
EXPORT_SYMBOL(sta2x11_sctl_mask);
u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
{
struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
u32 r;
unsigned long flags;
if (!mfd) {
dev_warn(&pdev->dev, ": can't access apb regs\n");
return 0;
}
if (!mfd->apbreg_regs) {
dev_warn(&pdev->dev, ": apb bridge not initialized\n");
return 0;
}
spin_lock_irqsave(&mfd->lock, flags);
r = readl(mfd->apbreg_regs + reg);
r &= ~mask;
r |= val;
if (mask)
writel(r, mfd->apbreg_regs + reg);
spin_unlock_irqrestore(&mfd->lock, flags);
return r;
}
EXPORT_SYMBOL(sta2x11_apbreg_mask);
/* Two debugfs files, for our registers (FIXME: one instance only) */
#define REG(regname) {.name = #regname, .offset = SCTL_ ## regname}
static struct debugfs_reg32 sta2x11_sctl_regs[] = {
REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL),
REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0),
REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1),
REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3),
REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1),
REG(SCCLKSTAT2), REG(SCRSTSTA),
};
#undef REG
static struct debugfs_regset32 sctl_regset = {
.regs = sta2x11_sctl_regs,
.nregs = ARRAY_SIZE(sta2x11_sctl_regs),
};
#define REG(regname) {.name = #regname, .offset = regname}
static struct debugfs_reg32 sta2x11_apbreg_regs[] = {
REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC),
REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG),
};
#undef REG
static struct debugfs_regset32 apbreg_regset = {
.regs = sta2x11_apbreg_regs,
.nregs = ARRAY_SIZE(sta2x11_apbreg_regs),
};
static struct dentry *sta2x11_sctl_debugfs;
static struct dentry *sta2x11_apbreg_debugfs;
/* Probe for the two platform devices */
static int sta2x11_sctl_probe(struct platform_device *dev)
{
struct pci_dev **pdev;
struct sta2x11_mfd *mfd;
struct resource *res;
pdev = dev->dev.platform_data;
mfd = sta2x11_mfd_find(*pdev);
if (!mfd)
return -ENODEV;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
if (!request_mem_region(res->start, resource_size(res),
"sta2x11-sctl"))
return -EBUSY;
mfd->sctl_regs = ioremap(res->start, resource_size(res));
if (!mfd->sctl_regs) {
release_mem_region(res->start, resource_size(res));
return -ENOMEM;
}
sctl_regset.base = mfd->sctl_regs;
sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl",
S_IFREG | S_IRUGO,
NULL, &sctl_regset);
return 0;
}
static int sta2x11_apbreg_probe(struct platform_device *dev)
{
struct pci_dev **pdev;
struct sta2x11_mfd *mfd;
struct resource *res;
pdev = dev->dev.platform_data;
dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev);
dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev);
mfd = sta2x11_mfd_find(*pdev);
if (!mfd)
return -ENODEV;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
return -ENOMEM;
if (!request_mem_region(res->start, resource_size(res),
"sta2x11-apbreg"))
return -EBUSY;
mfd->apbreg_regs = ioremap(res->start, resource_size(res));
if (!mfd->apbreg_regs) {
release_mem_region(res->start, resource_size(res));
return -ENOMEM;
}
dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs);
apbreg_regset.base = mfd->apbreg_regs;
sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg",
S_IFREG | S_IRUGO,
NULL, &apbreg_regset);
return 0;
}
/* The two platform drivers */
static struct platform_driver sta2x11_sctl_platform_driver = {
.driver = {
.name = "sta2x11-sctl",
.owner = THIS_MODULE,
},
.probe = sta2x11_sctl_probe,
};
static int __init sta2x11_sctl_init(void)
{
pr_info("%s\n", __func__);
return platform_driver_register(&sta2x11_sctl_platform_driver);
}
static struct platform_driver sta2x11_platform_driver = {
.driver = {
.name = "sta2x11-apbreg",
.owner = THIS_MODULE,
},
.probe = sta2x11_apbreg_probe,
};
static int __init sta2x11_apbreg_init(void)
{
pr_info("%s\n", __func__);
return platform_driver_register(&sta2x11_platform_driver);
}
/*
* What follows is the PCI device that hosts the above two pdevs.
* Each logic block is 4kB and they are all consecutive: we use this info.
*/
/* Bar 0 */
enum bar0_cells {
STA2X11_GPIO_0 = 0,
STA2X11_GPIO_1,
STA2X11_GPIO_2,
STA2X11_GPIO_3,
STA2X11_SCTL,
STA2X11_SCR,
STA2X11_TIME,
};
/* Bar 1 */
enum bar1_cells {
STA2X11_APBREG = 0,
};
#define CELL_4K(_name, _cell) { \
.name = _name, \
.start = _cell * 4096, .end = _cell * 4096 + 4095, \
.flags = IORESOURCE_MEM, \
}
static const __devinitconst struct resource gpio_resources[] = {
{
.name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */
.start = 0,
.end = (4 * 4096) - 1,
.flags = IORESOURCE_MEM,
}
};
static const __devinitconst struct resource sctl_resources[] = {
CELL_4K("sta2x11-sctl", STA2X11_SCTL),
};
static const __devinitconst struct resource scr_resources[] = {
CELL_4K("sta2x11-scr", STA2X11_SCR),
};
static const __devinitconst struct resource time_resources[] = {
CELL_4K("sta2x11-time", STA2X11_TIME),
};
static const __devinitconst struct resource apbreg_resources[] = {
CELL_4K("sta2x11-apbreg", STA2X11_APBREG),
};
#define DEV(_name, _r) \
{ .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, }
static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = {
DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */
DEV("sta2x11-sctl", sctl_resources),
DEV("sta2x11-scr", scr_resources),
DEV("sta2x11-time", time_resources),
};
static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = {
DEV("sta2x11-apbreg", apbreg_resources),
};
static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state)
{
pci_save_state(pdev);
pci_disable_device(pdev);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
return 0;
}
static int sta2x11_mfd_resume(struct pci_dev *pdev)
{
int err;
pci_set_power_state(pdev, 0);
err = pci_enable_device(pdev);
if (err)
return err;
pci_restore_state(pdev);
return 0;
}
static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev,
const struct pci_device_id *pci_id)
{
int err, i;
struct sta2x11_gpio_pdata *gpio_data;
dev_info(&pdev->dev, "%s\n", __func__);
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "Can't enable device.\n");
return err;
}
err = pci_enable_msi(pdev);
if (err)
dev_info(&pdev->dev, "Enable msi failed\n");
/* Read gpio config data as pci device's platform data */
gpio_data = dev_get_platdata(&pdev->dev);
if (!gpio_data)
dev_warn(&pdev->dev, "no gpio configuration\n");
dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__,
gpio_data, &gpio_data);
dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__,
pdev, &pdev);
/* platform data is the pci device for all of them */
for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) {
sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev);
sta2x11_mfd_bar0[i].platform_data = &pdev;
}
sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev);
sta2x11_mfd_bar1[0].platform_data = &pdev;
/* Record this pdev before mfd_add_devices: their probe looks for it */
sta2x11_mfd_add(pdev, GFP_ATOMIC);
err = mfd_add_devices(&pdev->dev, -1,
sta2x11_mfd_bar0,
ARRAY_SIZE(sta2x11_mfd_bar0),
&pdev->resource[0],
0, NULL);
if (err) {
dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err);
goto err_disable;
}
err = mfd_add_devices(&pdev->dev, -1,
sta2x11_mfd_bar1,
ARRAY_SIZE(sta2x11_mfd_bar1),
&pdev->resource[1],
0, NULL);
if (err) {
dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err);
goto err_disable;
}
return 0;
err_disable:
mfd_remove_devices(&pdev->dev);
pci_disable_device(pdev);
pci_disable_msi(pdev);
return err;
}
static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)},
{0,},
};
static struct pci_driver sta2x11_mfd_driver = {
.name = "sta2x11-mfd",
.id_table = sta2x11_mfd_tbl,
.probe = sta2x11_mfd_probe,
.suspend = sta2x11_mfd_suspend,
.resume = sta2x11_mfd_resume,
};
static int __init sta2x11_mfd_init(void)
{
pr_info("%s\n", __func__);
return pci_register_driver(&sta2x11_mfd_driver);
}
/*
* All of this must be ready before "normal" devices like MMCI appear.
* But MFD (the pci device) can't be too early. The following choice
* prepares platform drivers very early and probe the PCI device later,
* but before other PCI devices.
*/
subsys_initcall(sta2x11_apbreg_init);
subsys_initcall(sta2x11_sctl_init);
rootfs_initcall(sta2x11_mfd_init);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Wind River");
MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG");
MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl);
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